Shears.



PATENTED JUNE 25,1907.

' AiN. EASTMAN.

SHEARS. I APPLICATION FILED NOV. 16, I903. RENEWED JUNE 3, 190711%ENTOR.

T T ORNE V.

ALBERT N. EASTMAN, or CHICAGO, ILLINOIS. {j

SHEARS- Specification of Letters Patent.

Patented June 25, 1907.

Application filed November 16, 1903. Renewed June 3, 1907. Serial No.377,049.

To all whom it may concern:

Be it known that I, ALBERT N. EAST- MAN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Shears.

I am aware that there are several ways of accomplishing this result, theones with which I am familiar having one or another reason whichprevents their becoming a success commerc ally.

The object of my invention is to produce a shear the tension of whoseblades can be adjusted before leaving the factory, and which will remainthe same in use, and to provide a means whereby an equal tension will beexerted on each blade, and has for its further object to accomplish theabove result without materially increasing the expense of producing theshears.

My invention consists of the new and novel features and combination ofpartshereinafter described and claimed.

My method of accomplishing the foregoing objects may be more readilyunderstood by having reference to the accompanying drawings, which arehereunto annexed, and which are a part of this specification, in whichFigure 1. is a side view of a pair of shears with my improvementthereon. Fig. 2 is an edge view of the same. Fig 3 is an enlargeddetail, partly in section, illustrating my device.

Similar letters refer to similar parts throughout the entiredescription.

In the drawings, a is a pair of shears. a is the pivot screw which holdsthe blades together. passageor channel a through its center. Mounted inthis channel or passage (1? is a pin (1 having a head a and a thread aout upon its end, and a nut a mounted upon said thread, this pin beingconstructed of such diameter as to permit ample clearance between it andthe sides of the channel or passage a permitting it to turn freely withthe movement of the shears. Mounted upon the pin a between the head ofthe pivot screw a and the head a of the pin a is a flat bow spring 6,its ends b bearing against the side of 'theblade of the shears. Asimilar spring 19 is mounted at the opposite side of the shears betweenthe nut a and the threaded. end of the pivot screw a its ends I) bearing.on the side of this blade of the shears. By turning the nut a upon thepin a the This screw is constructed with a tension of these two springsb and b can be regulated with extreme nicety. The nut can then be lockedby slightly riveting the end of the pin a, so as to prevent the tensionof the springs being altered after the shears leave the factory.

It will be seen that the flat springs b and b and the pin' a are theonly additions which it is necessary to add to the ordinary pair ofshears in order to furnish a shear which will at all times maintain aconstant and equal tension, and produce a'shear cut by the action of theblades one u on another.

Having describe my invention, what I regard as new and desire to secureby Letters Patent is:

1. In combination with a pair of shears, the pivot screw of which has acircular hole or channel through its center, a pin mounted in saidchannel, having a head at one end and a thread out upon its other end, anut mounted upon said thread, two flat springs formed in a bow having anopening at the center of the bow, mounted upon the said pin at each sideof the shears, the ends of the bows bearing against the sides of theshears, for the purpose set forth substantially as described.

2. In combination with a pair of shears, a hollow pivot screw, two flatsprings formed in the shape of abow, having a hole at the center ofthebow, mounted upon a pin which passes through the hollow pivot screw, theends of said bows bearing against the sides of the shears, means toadjust the tension of said bow springs, for the purpose set forthsubstantially as described.

3. In combination with a pair of shears, a hollow pivot screw, springactuated means exerting an equal pressure. upon both sides of the shearssaid means being mounted on a in passing through said hollow pivot screwor the purpose set forth substantially as described.

4. In combination with a pair of shears, a hollow pivot screw, springactuated means mounted upon a pin passing through said hollow pivotscrew exerting an equal pressure upon both sides of the shears, means toadjust the tension of said springs, for the purpose set forthsubstantially as described.

5. In combination with a pair of shears, a hollow pivot screw, a pinpassing through said hollow pivot screw spring actuated means mountedupon said pin exerting an equal pressure upon both sides of the shears,

means to adjust the tension of said springs, means to make saidadjustment permanent, for the purpose set forth substantially asdescribed.

6. In combination with a pair of shears, a hollow pivot screw, two flatsprings formed in the shape of a bow, having a hole at the center of thebow, mounted upon a pin which passes through the hollow pivot screw, theends of said bows bearing against the sides of the shears, means toadjust the tension of said bow springs, means to lock said adjustmentwhen made, for the purpose set forth substantially as described.

7. In combination with a pair of shears,

the pivot screw of which has a circular hole or channel through itscenter, a pin mounted in said channel, having a head at one end and athread out upon its other end, a nut mounted upon said thread, a flatspring formed in a bow having an opening at the center of the bow,mounted upon the said pin of the shears,

. the ends of the bow bearing against the side of. the shears, for thepurpose set forth substantially as described.

8. In combination with a pair of shears, a

hollow pivot screw, a flat spring formed in the shape of a bow, having ahole at the center of the bow, mounted upon a pin which passes throughthe hollow pivot screw, the ends of said bow bearing against the side ofthe shears, means to adjust the tension of said bow spring, for thepurpose set forth substantially as described.

9. In combination with a pair of shears, a hollow pivot screw, a flatspring formed in the shape of a bow, having a hole at the center of thebow, mounted upon a pin which passes through the hollow pivot screw, theends of said bow bearing against the side of the shears, means to adjustthe tension of said bow spring, and means to lock said. ad justment whenmade, for the purpose set forth substantially as described.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

ALBERT N. EASTMAN.

Witnesses:

H. A. EASTMAN, EDWARD G. EASTMAN.

